Initial commit: wowee native WoW 3.3.5a client

include/rendering/frustum.hpp

@@ -0,0 +1,88 @@
+#pragma once
+
+#include <glm/glm.hpp>
+#include <array>
+
+namespace wowee {
+namespace rendering {
+
+/**
+ * Frustum plane
+ */
+struct Plane {
+    glm::vec3 normal;
+    float distance;
+
+    Plane() : normal(0.0f), distance(0.0f) {}
+    Plane(const glm::vec3& n, float d) : normal(n), distance(d) {}
+
+    /**
+     * Calculate signed distance from point to plane
+     * Positive = in front, Negative = behind
+     */
+    float distanceToPoint(const glm::vec3& point) const {
+        return glm::dot(normal, point) + distance;
+    }
+};
+
+/**
+ * View frustum for culling
+ *
+ * Six planes: left, right, bottom, top, near, far
+ */
+class Frustum {
+public:
+    enum Side {
+        LEFT = 0,
+        RIGHT,
+        BOTTOM,
+        TOP,
+        NEAR,
+        FAR
+    };
+
+    Frustum() = default;
+
+    /**
+     * Extract frustum planes from view-projection matrix
+     * @param viewProjection Combined view * projection matrix
+     */
+    void extractFromMatrix(const glm::mat4& viewProjection);
+
+    /**
+     * Test if point is inside frustum
+     */
+    bool containsPoint(const glm::vec3& point) const;
+
+    /**
+     * Test if sphere is inside or intersecting frustum
+     * @param center Sphere center
+     * @param radius Sphere radius
+     * @return true if sphere is visible (fully or partially inside)
+     */
+    bool intersectsSphere(const glm::vec3& center, float radius) const;
+
+    /**
+     * Test if axis-aligned bounding box intersects frustum
+     * @param min Box minimum corner
+     * @param max Box maximum corner
+     * @return true if box is visible (fully or partially inside)
+     */
+    bool intersectsAABB(const glm::vec3& min, const glm::vec3& max) const;
+
+    /**
+     * Get frustum plane
+     */
+    const Plane& getPlane(Side side) const { return planes[side]; }
+
+private:
+    std::array<Plane, 6> planes;
+
+    /**
+     * Normalize plane (ensure unit length normal)
+     */
+    void normalizePlane(Plane& plane);
+};
+
+} // namespace rendering
+} // namespace wowee